Spoilers for those who haven't read it.
Pretty good as a whole. Some OC's are pretty well done, and frankly could've had more done with them (Mari, Stefan, Yuna, hell Sparrga and Vanguard). Tally and Kasumi are much more rounded than Butterflaizen. Ichigo is an improvement over canon, ditto Soifon, and saving Kaien and Hisana
is a decision I wholeheartedly approve of. Also felt Tatsuki was well handled. Nemu, who doesn't get talked about a lot by the peanut gallery, got some much needed love; head would say Nelouch, heart Yulouch as preferred couple, but hey. Yama is less annoying than canon, and hell I actually started to like Byakuya! (Well, Kyo is very Moe)
So, in short, many characters had their more annoying tendancies downplayed, which is a relief. And the ones that don't get some measure of cummupance.
Now, the bad.
I felt the Cornelia arcs fell completely flat; the Ichigo vs Army thing was not believable, even hampered as he was, he should've won easily. Also not that happy that Orihime took so long to pull herself together; it replaced sympathy with annoyance. Glad that the author didn't go through with the original plan for Yuna—>Shirley (coz I hate Shirley. I hated her in CG too; she seems to exist just to get in Lelouch's way imo) and, frankly, pulling a few plot about-faces (as revealed in dA's notes did wear a little thin. I also agree somewhat with what someone said, that Yuna's return
was kinda wasted/pointless considering how it turned out.
And, having read a few other of the author's fics, I get the distinct impression he REALLY does not like Sajin hence all the humiliating/degrading/jerkass moments he endures, this one at least has him go out against a strong foe and without a caveat; not happy with the way he was handled regardless.
Yammy was also kinda underwhelming for all his alleged power.
I know it's supposed to be Lelouch vs Aizen......and I don't care! Kasumi would've made a better final boss than Mr Boring. And post eye of the storm...Aizen is an egotist to the highest degree; surely the worst punishment imaginable for him is to not exist at all, so having him reincarnated would be the worst punishment for him, so I find the constant recapturing
to be frankly kinda dumb on Rita's/Soul King's part.
7/10; 8 if I'm generous.